BOSTON (AP) — Two bombs exploded near the crowded finish line of the Boston Marathon on Monday, killing two people and injuring more than 50 others in a terrifying scene of broken glass, smoke and severed limbs, authorities said.

A third blast rocked the John F. Kennedy Library a few miles away and more than an hour later, but no injuries were reported, the police commissioner said. A senior U.S. intelligence official said two other explosive devices were found near the marathon finish line.